Abstract: Roofbolter is equipped on kinds of bolt support equipments as an important working mechanism. Because the current roofbolter is asymmetric in structure, various faults occur. And stoppages degrade these equipments’ whole performance. The structure of the asymmetric roofbolter is introduced in detail. Various faults caused by long feed cylinder and short feed cylinder are all described respectively. The causes of the faults are analyzed specially. And the improvement direction and method is presented in the end. This essay is conductive to cognize the framework and fault form of asymmetric roofbolter, and it also can provide theoretical support to improve roofbolter’s structure in the future.